Today, my DH told me that when he was five years old and on holiday in Europe, his parents went out alone for dinner, telling him and his sister (same age) to lock the door behind them and keep it locked until they came back. DH remembered a rock pool he'd seen that day so instead, he went out to explore it (in the night) and was so long doing so that when he came back, his sister had fallen asleep and he was locked out. He was forced to sleep on the floor of the corridor outside until his parents returned from dinner.
I was
. I mean, my mum and dad were definitely "light touch" parents in the 80s but I don't think they'd have ever done this certainly not at a hotel since it was camping every year for us. Was this a "thing" that many parents did? DH seems to think it was perfectly normal (although agrees we wouldn't leave our own kids in this way)!